I think the description and test suite on this problem is slightly off. When I see 'union' I already assume that no duplicates are permitted and order is irrelevant.
Return 'on' or 'off'
Create incrementing array
Vector Magnitude Calculator
Sum of series III
Back to Basics - Find no. of elements in a matrix?
most frequent character
Alternately upper-lower case
Sum of odd numbers in a matrix
index of n^2 in magic(n)
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